Normalization of absorbed energy and pressure in laser-induced breakdown in mono-atomic and molecular gases according to incident laser energy and initial pressure. (28th August 2020)

• Record Type: Journal Article
• Authors: Rudz, Steve; Flaugere, Robin; Wartel, Maxime; Pellerin, Stéphane; Hanus, Jean-Luc
• Is Part Of: IOP SciNotes. Volume 1:Number 2(2020)
• Publication Date: 2020-08-28
• Subjects: laser -- absorbed energy -- normalization; 500
• DOI: 10.1088/2633-1357/abaf37
• Languages: English
• ISSNs: 2633-1357

Abstract

Abstract: In laser-induced breakdown experiments, the absorbed energy is one of the first measured parameters. For a given optical configuration and incident energy, the measured absorbed energy depending on pressure always exhibits a similar curve for the tested gases: argon, nitrogen, carbon dioxide and air. This work presents an empirical modelling to predict the pressure dependence of the absorbed energy in mono-atomic and molecular gas efficiently. The first series of experiments, involving Ar, N2 and CO2, presents its efficiency over pressure from 50 to 2400 mbar and incident laser energies from ∼15 to ∼135 mJ. The second series presents the effectiveness of this modelling on air. All experiments are conducted with a Nd:YAG laser at 532 nm and a focal radius of 4.23 μ m.